Shade roller check



May 31, 1938. 1 M wlLsoN d 2,119,408

SHADE ROLLER CHECK Filed Aug. 6, 1936 sham f .ff @y y NVENTO Patented May 31, 193s `SHADE ROLLER CHECK 1 James M. Wilson, Newark, N. J., assigner, by mesne assignments, to Shade Check, Inc., Newark, N. J., a corporation of New Jersey Application August 6, 1936, Serial No. 94,559

6 Claims. e (Cl. 156-36) This invention relates particularly to spring Y actuated window shade rollers, and more especially to a check for preventing rotation of the roller under the influence of the spring at a speed :in excessof a predetermined limit, for example when a shade escapes from the hand of the person raising or lowering the shade. However, the invention is equally susceptible to other types of spring operated rollers.

novel and improved check of the character described whichshall include a part projected from one end of the roller into a position to engage a stationary support or part, for example a shade zbracket, by centrifugal force caused by rotation of the roller at excessive speed so as to stop rotation of the roller.

Another object is to provide such a check which shall include a stop dog mounted on one end of the roller and rnormally permitting rotating thereof at a speed below a predetermined limit, and an actuator mountedvon the roller and operated by centrifugal action upon rotation of the roller at a speed in excess of said limit to prolzject said dog from the end of the roller into position to engage a support and stop rotation of the roller. l

Other objects are to provide a shade roller check unit which can be easily and quickly ap- Y.plied to the end of a roller opposite the usual controlling pawls and ratchets so that the unit can be supplied to users of shade rollers for application to rollers already in use, and to' obtain other advantages and results as will be brought out by the following description.

Referring to the drawing,

Figure 1 is a top plan view of Va shade roller installed in brackets and having a check embodying my invention applied thereto.

t Figure 2 is a sectional view on` an enlarged'scale taken on the line 2-2 of Figure 1.

Figure 3 is a view similar to Figure 2 with theA end of the check casing removed and with the stop dogV and actuator in normal position.

Figure 4 is a view similar to Figure 3 showing the stop dog projected from the roller to stop rotation of the same.

Figure 5 is a` transverse sectional view through the casing only on the line 5-6 of Figure 3 and y,showing the stop dog and actuator in side elevation.

Figure 6 is a complete transverse sectional view on rthe line 5-6 of Figure 3.

Figure 'l is a transverse sectional View through zthecasing only on theline 1-1 of Figure 4,

One object of the invention is to pro-vide aA showing the stop dog and actuator in side elevation. Y

Figure 8 is an end elevation of the roller and the stationary support showing the engagement of thestop dog with the support to stop the roller.

Figure 9 is a horizontal sectional view through the casing only on the line 9-9 of Figure 7 showing the manner of returning the stop dog to normal position.

Figure 10 is an inside elevation of the cover plate of the check casing.

Figure 11 is a View similar to Figure 5 but on a reduced scale, showing a slightly modied construction, and

Figure 12 is an end view of Figure 11 looking from right to left.

Specifically describing the invention the reference character A designates a spring operated shade roller of known construction having the usual controlling paw] and ratchet mechanism `B at one end, a fixed shaft C and a rotatable trunnion D at its opposite ends mounted in stationaryV supports or brackets E. Within the roller is the usual spring F for normally rotating the roller in one direction, for example to wind the shade thereonJ th-e spring being tensioned or wound by rotation of the roller in the other direction as in lowering the shade.

At the end of the roller opposite the controllingv pawls B is the check embodying my invention. This check is shown as including a casing G composed of two telescopically connected cup shaped sections I and 2. The casing is secured to the end of the roller in any suitable manner as by screws 3 passing through the casing, and preferably the trunnion D is secured to the casing between the casing sections, as by a shoulder 4 clamped between the sections, and has a pointed portion 5 driven into the roller.

Within the casing is a stop dog 6 which is pivotally mounted on a pin 'l in a bracket 10 on an axis perpendicular to the axis of the roller and casing so vthat the dog may lie `wholly within the casing as shown in Figures 3 and 5 or may be projected about its pivot from the casing through an opening 2a therein, as shown in Figures 4 and 7.

An vactuator lever 8 is pivotally mounted between its ends in the casing on a pin 9 on anaxis parallel with the axis of the roller and the casing to be swung about its pivot by centrifugal action upon the rotation of the roller and casing.` One enol of the actuator lever has a cam surface Ill cooperating with a cam surface ll on the stop dog for initiating the projection of the dog aboutv its pivot outwardly of the casingl upon rotation of the roller and casing at a speed in excess of a predetermined limit. The pivoted end of the dog has a shoulder l2 to engage the bracket and limit pivotal movement of the dog outwardly of the casing as clearly shown in Figure 9, and a spring i3 is secured in the casing to abut said shoulder and hold the dog in normal position Within the casingr as shown in` Figure 3.

In operation, when the `roller is rotated against the influence of the spring to lower the shade, or under the influence of the spring to raise the4 shade at a normal speed below a predetermined limit the stop dog is positioned withinthe casing so as to permit the free rotationnof the roller, u as shown in Figures 2 and 4, Should kthe shadev escape from the hand of the person adjusting it, or get out of control for any reason and revolve under the influence of the spring at val greater than normal speed or in excess of a predetermined speed, the centrifugal force set up by rotation of the'roller will swing the actuator lever 8 as shown in Figure 4 so as to cause sudden -engagement of the -cam surfaces I and il of the actuator and the dog and swing the free end of tliedog out of the 'casing whereupon centrifugal action will project the dog out of the casing from and beyond the end of the roller into a position' toy engage the edge of the adjacent stationary support or bracket Erand thereby stop rotation of the roller as shown iny Figure 8. Upon rotation of the roller in the opposite direction to unwind or lower the shade, the dog `will engage the opposite edge of the stationary support E Vand be returned into the casing,rFigure 9 illustrating the position of the dog just prior to engagement thereof with the support E during this operation. Preferably the dog will have a cam surface I to engage the supportE and facilitate this action.

In Figures 11 and 12, the; parts! and 2 areV held in place by frictional engagement with the other partsthrough or into which it is driven, or by brads IT. Y

It will thus be seen that the invention provides a reliable simple and inexpensive check to prevent running away of a spring operated roller under the` influence of the spring, and the check constitutes-a unit which may be applied to different rollers as desired without modification of the roller,

While the form of the inventionherein described is the now preferred form, it should be understood that it is primarily for the purposer of illustrating the principles of the invention and that many modifications and changes may be made in the details of structure Without departing from thev spirit or scope of the invention.`

Having thus described' my invention, what I claim is:

`1. The combination with a spring actuated roller and a stationary support therefor at one end, of means for checking the roller upon rotation thereof under influence of the spring at a speed in excess of a predetermined limit saidk means comprising a stop dog pivotally mounted on said roller on an axis perpendicular to the axis of the roller `and normally permitting rotation of the roller at a speed below said limit, and an actuator lever pivoted on said roller on Van axis parallel to the roller axis to beswungabout itspivot by cen- 'rn'ally disposed within the casing and an actuator leverjpivotally mounted in said casing on an axis parallel to thecasing axis to be swung by centrifugal action upon rotation of said casing at a speed aboutits axis in excess of a predetermined limit, said dog and actuator lever having cooperating cam surfaces to project said dog about its pivot outwardly from the casing upon rotation of the casing at a speed in excess of said limit.

' 3.v A spring roller check unit of the character described comprising a casing to be secured coaxially to one end of a spring roller, a stop dog pivotally mounted in saidY casing on anA axis perpendicular to the axis of the casingand normally disposed within the casing, and anv actuator movably mounted inl said casing to be operated by centrifugal force upon rotation of said casing about its axis at a speed in excess of a predetermined limit, said dog and vsaid actuator having cooperating cam surfaces engageable upon such operation of said actuator by centrifugal force to project said dog about its pivot outwardlyfrom the casing upon rotation of the casing at a speed in excess'of said limit.

4. The combination with a spring actuated roller and a stationary support therefor at one end, of means for checking the roller upon rotation thereof under inuenceof the spring at a speed in excess of a predetermined limit, said means corn-V prising a stop dog pivotally mounted on said roller on an axis perpendicular to the axis of the roller and' normally permitting rotation of the roller at a speed below said limit, and an actuator rnovably mounted on said roller to be operated by centrifugal force upon rotation of said roller about its axis in excess of a predetermined speed, said deg and saidl actuator having cooperating cam surfaces engageable upon such operation of the actuatorv by centrifugal force to project said dog about its pivot into a position to engage said stationary support and stop rotation of the roller.

5. The combination with a spring actuated roller and a stationary support therefor at one end, of means for checking the roller upon rotation thereof under influence of the spring at a speed in excess of a predetermined limit, said means comprising a stop dog pivotally mounted on one end of said roller on an axis perpendicular to the axis of the roller and normally permitting rotation of the roller at a speed below said limit, and an actuator movably mounted on said end of the roller tofbe operated by centrifugal force upon rotation of said roller about its axis in excess of a predetermined speed, said dog and said actuator having cooperating cam surfaces engageable upon such operation of the actuator by centrifugal force to project Ysaid dog about its pivot 'from said'end of the roller into a position to engage said stationary support and stop rotation of the roller.

6. The combination with a spring actuated roller anda stationary support therefor at and beyond one end thereof, of meansvfor checking Cil the roller upon rotation thereof under influence of the spring at a speed in excess of a predetermined limit, said means comprising a stop dog mounted on said end of the roller to normally clear said stationary support and to move in a direction parallel to the axis of the roller to project from said end of the roller into position to engage said stationary support and stop rotation of the roller, and means operated by centrifugal force for so projecting said dog from the end of the roller upon rotation of the roller at excessive Y speed.

JAMES M. WILSON. 

